JP2009236324A - Method for manufacturing heat exchanger, and indoor unit of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a heat exchanger for improving performance and being miniaturized by preventing thermal interference to a heating supercooling range without degrading rigidity of fins, and to provide an indoor unit of an air conditioner comprising the heat exchanger obtained by the method and for improving heat exchanging performance. <P>SOLUTION: This method for manufacturing the heat exchanger 8 includes a process for integrally molding the fins F of a front-side heat exchanger section 8A and a rear-side heat exchanger section 8B continuously in the longitudinal direction, a process for forming heat exchange pipe mounting holes (a) of a plurality of lines to the circulating direction of the heat exchanging air, a process for forming a slit K for blocking heat between the heat exchange pipe mounting hole of the most windward-side line and the heat exchange pipe mounting hole of the most leeward-side line while they are overlapped to or communicated with each other at one end, a process for forming a cut section Kb by cutting the fins in the width direction, a process for arranging the plurality of sheets of fins, and inserting heat exchange pipes P into the heat exchange pipe mounting holes to fix the fins, and a process for folding the front-side heat exchanger section and the rear-side heat exchanger section roughly into the inverted V-shape in a side view while the cut section is located at an upper end. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a heat exchanger formed in a substantially inverted V shape in a side view, and an indoor unit of an air conditioner including the heat exchanger.

  In the refrigeration cycle, a heat exchanger having a structure in which a plurality of rows of heat exchange pipes (heat transfer tubes) are provided in the fins along the flow direction of the heat exchange air is frequently used. When this type of heat exchanger is used as a condenser particularly during heating operation, the gas refrigerant is guided at the refrigerant inlet, and the refrigerant condenses as it exchanges heat with air or water.

  That is, it changes to a two-phase region where liquid refrigerant is mixed with gas refrigerant. As the heat exchange further progresses, the ratio of the liquid refrigerant increases, and the phase changes to a single-phase region of only the liquid refrigerant before the refrigerant outlet. In the two-phase region of the gas refrigerant and the liquid refrigerant, an isothermal change is made. However, in the single-phase region of only the liquid refrigerant, the refrigerant temperature is lowered due to supercooling and there is a temperature gradient. A large temperature gradient is generated between the two-phase region and the single-phase region.

  Due to the large temperature gradient between the two-phase region and the single-phase region, heat conduction occurs between the heat exchange pipes via the fins, which becomes an obstruction factor for heat transfer to the air side. Therefore, for example, in [Patent Document 1] and [Patent Document 2], a slit for blocking heat is provided between heat exchange pipes adjacent to each other in the flow direction of heat exchange air having a difference in refrigerant temperature.

  In particular, in [Patent Document 1], the vicinity of the pipe portion with the smallest number of paths in the refrigerant outlet direction in the condenser is arranged on the windward side with respect to the main air flow direction. The fins between the pipes on the leeward side adjacent to these pipes are provided with slits for cutting off the heat conduction in the longitudinal direction of the fins and separated thermally.

Thus, if the slit for interrupting | blocking heat conduction is cut | disconnected from the one end edge of a fin, a fin will become a shape where three sides became independent. That is, each of the side part on the windward side, the side part in the longitudinal direction of the fin, and the side part provided with the slit is thermally opened. Therefore, it is considered that the heat shielding effect is increased, and the degree of supercooling of the refrigerant at the refrigerant outlet is increased.
Japanese Patent Laid-Open No. 10-2638 JP 2004-85139 A

  However, if the slit is cut from one end edge of the fin, the rigidity of the cut fin end is greatly reduced. The fin is formed by continuously pressing one large thin plate body. However, if a cut is provided from the edge, the fin is easily deformed, such as turning up around the cut.

  Moreover, the fins are arranged with a narrow gap therebetween, and a heat exchanger is obtained by passing through and fixing the heat exchange pipes to these fins. At this time, if there are already partially deformed fins, they cannot contact each other and maintain a narrow gap. Although it is a completed heat exchanger, heat exchange air cannot flow between the fins, resulting in a decrease in heat exchange efficiency.

  By shortening the length of the slit as much as possible, partial deformation of the fin can be prevented, but the heat transfer blocking effect is reduced. Therefore, as in [Patent Document 2], a slit for blocking heat transfer between the heat exchange pipes on the windward side and the leeward side is provided at a position where there is a gap from the edge of the fin.

  A non-cut portion that is not cut is formed between the end edge of the fin and the end edge of the slit provided here. In addition, a plurality of slits are provided intermittently over the entire length of the supercooling region, and there are uncut portions between these slits. In total, there are non-cut portions that cannot be ignored, which affects the heat shielding effect.

The present invention has been made on the basis of the above circumstances, and its object is to penetrate the heat exchange pipe through the fin, and from the front side heat exchanger part and the rear side heat exchanger part, it is substantially reversed in side view. This is a V-shaped heat exchanger, and when a heat insulation slit is provided between the wind-up row and the heat-exchange pipe mounting holes in the downstream row, the temperature gradient during heating operation is maintained without impairing the rigidity of the fins. It is an object of the present invention to provide a method of manufacturing a heat exchanger that prevents thermal interference between a supercooling region having a temperature difference and a two-phase region having no temperature gradient, thereby improving performance and achieving downsizing.
Furthermore, it is intended to provide an indoor unit of an air conditioner that includes the heat exchanger obtained by the above-described manufacturing method and can obtain an improvement in heat exchange performance.

In order to satisfy the above object, the present invention comprises a plurality of fins arranged side by side at a predetermined interval, and heat exchange pipes that penetrate the fins and are provided in a plurality of rows along the flow direction of the heat exchange air. , A heat exchanger manufacturing method for manufacturing a heat exchanger configured to form a substantially inverted V shape in a side view from a front heat exchanger part and a rear heat exchanger part,
The fins forming the front heat exchanger part and the fins forming the rear heat exchanger part are formed integrally in the longitudinal direction, and the fins of the front heat exchanger part and the fins of the rear heat exchanger part are integrally formed. In each of the fins, the end portions of the fins overlap each other in the width direction of the fins or communicate with each other between the heat exchange pipe mounting holes that are the most leeward row and the heat exchange pipe mounting holes that are the leeward row. A step of providing a heat blocking slit along the longitudinal direction and straddling an overlapping portion or a communicating portion formed at one end of the heat blocking slit provided in each of the front heat exchanger portion and the rear heat exchanger portion A step of cutting in the width direction of the fins, and a step of arranging the front heat exchanger and the rear heat exchanger part in a substantially inverted V shape in a side view with the cut part as an upper end.

  In order to satisfy the above object, an indoor unit of an air conditioner according to the present invention has an indoor unit body provided with a suction port and an outlet port, and is disposed in the indoor unit body and has a substantially inverted V shape in a side view. A heat exchanger composed of a front heat exchanger section located on the front side of the indoor unit body and a rear heat exchanger section located on the rear side, and the front heat exchanger section and the rear heat of the heat exchanger And a fan disposed between the exchanger sections, and the heat exchanger is manufactured by the heat exchanger manufacturing method described above.

According to the present invention, when the heat insulation slit is provided between the wind-up row and the heat exchange pipe mounting hole in the downstream row, the rigidity of the fin is not impaired, and the performance is improved by preventing thermal interference. As a result, the heat exchanger can be reduced in size.
Furthermore, the indoor unit of the air conditioner which is provided with the heat exchanger obtained by the above-mentioned manufacturing method and can obtain the improvement of heat exchange performance can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view schematically showing a cross section of an indoor unit of an air conditioner (note that components that are not denoted by reference numerals are not illustrated even if they are described. Some parts are not attached.)

  The indoor unit main body 1 includes a front panel 2 constituting a front casing and a rear main body 3 constituting a rear casing, and is formed in a horizontally long shape in the width direction with respect to the vertical direction. A front suction port 4 is opened at a part of the front side of the indoor unit body 1, and an opening / closing panel 2 </ b> A supported by an opening / closing drive mechanism is fitted into the front panel 2 facing the front suction port 4.

  When the operation shown in FIG. 1 is stopped, the opening / closing panel 2A is flush with the front panel 2 and closes the front suction port 4. During operation, the opening / closing panel 2A protrudes and displaces to the front, creating a gap communicating with the room around it. The inlet 4 is opened indoors. An upper surface suction port 5 is opened at the upper part of the indoor unit main body 1, and a frame-like bar partitioning into a plurality of spaces is fitted into the upper surface suction port 5.

  A blow-out opening 6 is opened at the lower front portion of the indoor unit body 1, and two blow-out louvers 7 a and 7 b are provided substantially in parallel to the blow-out opening 6. The blowout louvers 7a and 7b can open and close the blowout opening 6 according to their respective rotation postures and set the blowout direction of the heat exchange air according to operating conditions.

  A heat exchanger 8 to be described later is disposed in the indoor unit body 1. The heat exchanger 8 is formed in a substantially inverted V shape in a side view by a front heat exchanger portion 8A and a rear heat exchanger portion 8B. The front heat exchanger portion 8A is formed in a curved shape so as to face the entire front suction port 4 and a part of the upper suction port 5. The rear heat exchanger portion 8B is straight and obliquely inclined and faces a part of the upper surface suction port 5.

  A blower 10 is disposed between the front and rear heat exchanger portions 8A and 8B of the heat exchanger 8. The blower 10 includes a fan motor disposed in a space on one side end of the indoor unit body 1 and a cross-flow fan connected to a rotation shaft of the fan motor. The axial direction length of the cross flow fan is set to be the same as the width direction length of the heat exchanger 8 and is arranged so as to face each other correctly.

  The lower end portion of the front side heat exchanger portion 8A is placed on the front drain pan 12a, and the lower end portion of the rear side heat exchanger portion 8B is placed on the rear drain pan 12b. The front and rear drain pans 12a and 12b are respectively formed integrally with the rear main body 3 so that drain water dripped from the heat exchanger portions 8A and 8B can be received and drained to the outside via a drain hose (not shown). .

  The outer surface of a part of the side walls of the front and rear drain pans 12a and 12b is provided close to the blower 10, and constitutes a nose for the crossflow fan of the blower 10. A partition wall member 14 connects the side wall portions of the front and rear drain pans 12a and 12b serving as the nose and each side portion of the outlet 6.

  By driving the indoor blower 10, the space surrounded by the partition wall member 14 becomes a blowout ventilation path 15 </ b> A that communicates the nose and the blowout opening 9. On the other hand, a suction ventilation path 15B is formed between the front suction port 4 and the upper suction port 5 and the heat exchanger 8.

  A front air filter 16 is attached between the front suction port 4 and a part of the front heat exchanger part 8A of the heat exchanger 8, and the upper surface suction port 5, a part of the front heat exchanger part 8A and the rear heat exchanger part. An upper air filter 17 is attached between the 8B and 8B. The front air filter 16 and the upper air filter 17 are movably supported by an upper frame provided between the heat exchanger 8 and the front panel 2.

  An air filter cleaning unit W is also attached to the upper frame. The air filter cleaning unit W is disposed in a dead space between the front upper end of the front panel 2 and the upper front end, and is interposed between the upper end of the front air filter 16 and the front end of the upper air filter 17. ing.

  In accordance with a control signal from the control unit, the front air filter 16 is moved forward to the upper surface side of the upper air filter 17 and then moved backward. During the movement, the front air filter 16 passes through the air filter cleaning unit W. The air filter cleaning unit W automatically removes the dust that the front air filter 16 captures and remains attached.

  Subsequently, the upper air filter 17 is reciprocated to the front side of the front air filter 16, and the air filter cleaning unit W automatically removes adhering dust during the movement. The removed dust is automatically discharged outdoors. As described above, the air filter cleaning unit W automatically cleans the front air filter 16 and the upper air filter 17 to reduce maintenance work.

  Between the front heat exchanger portion 8 </ b> A of the heat exchanger 8 and the front air filter 16, an electric dust collector and an air purifying unit Y composed of a power supply portion are attached. The electric dust collector has a function of collecting and collecting fine dust that passes through the front air filter 16 and the upper air filter 17 without being captured.

  Recent electrostatic precipitators also have a function of generating ions. For example, during the cooling operation, the air guided to the heat exchanger 8 is changed to cool air and dehumidification drying is performed. As a result, the humidity in the indoor unit body 1 is increased, and an atmosphere in which molds are likely to be generated in the heat exchanger 8 over a long period of use. Therefore, ions are generated to sterilize molds and suppress the generation of off-flavors.

Next, the operation of the indoor unit of the air conditioner configured as described above will be described.
When the user presses the operation button on the remote control (remote control panel), the blower 10 is driven and the air cleaning unit Y acts. Further, the compressor is driven in the outdoor unit communicating with the indoor unit through the refrigerant pipe, and the refrigeration cycle operation is started.

  The room air is sucked into the indoor unit main body 1 from the front suction port 4 and the upper surface suction port 5, guided along the suction ventilation path 15 </ b> B, and passes through the front air filter 16 and the upper surface air filter 17. At this time, dust contained in the room air is captured by the front air filter 16 and the upper air filter 17.

  Furthermore, the air purification unit Y electrically collects finer dust and deodorizes it. The cleaned indoor air flows through the heat exchanger 8 and performs a heat exchange action with the refrigerant led to the room air. Thereafter, the heat exchange air is guided along the blowout ventilation path 15A, guided to the blowout louvers 7a and 7b from the blowout opening 6, and blown into the room, and the efficient air conditioning operation is continued.

Next, the heat exchanger 8 will be described in detail.
The heat exchanger 8 is formed in a substantially inverted V shape when viewed from the side. The heat exchanger 8 includes a first heat exchanger portion 8A in which a substantially intermediate portion in the vertical direction is arcuate and the upper and lower portions are straight, and a second heat exchanger portion 8B that is formed in a straight shape as a whole. Are connected to each other at the end.

  The connecting portion between the first heat exchanger portion 8A and the second heat exchanger portion 8B is cut and formed, and there are only a few actual connecting portions. By bending the second heat exchanger portion 8B from the connecting portion at a predetermined angle, the second heat exchanger portion 8B is formed in a substantially inverted V shape in a side view. In addition, you may cut | disconnect a connection part completely and may arrange | position in a substantially reverse V shape (a substantially C shape is included) by side view.

In a state in which such a heat exchanger 8 is incorporated in the indoor unit body 1, the first heat exchanger portion 8A is located on the front side, and this portion is referred to as a “front heat exchanger portion” 8A. The second heat exchanger section located at the rear of this is referred to as “rear heat exchanger section” 8B.
The heat exchanger 8 is a so-called finned tube type comprising a large number of fins F arranged with a narrow gap between each other and heat exchange pipes P that pass through the fins F and are fitted by a pipe expanding means. is there.

The heat exchange pipe P is formed so that the straight part is folded back into a long U shape, and penetrates the heat exchange pipe mounting hole provided in the fin F. The folded portion of the U-shaped tube protrudes from one end of the fins F arranged.
The other end openings of these U-shaped tubes protrude from the other end of the fins F arranged. The open ends of adjacent U-shaped tubes are connected by a U-bend, a three-way bend, a jumper pipe, or the like. Therefore, the heat exchange pipe P constituting the heat exchanger 8 is in a state of penetrating the arranged fins F while meandering from one end to the other end.

  The front heat exchanger 8A has a two-row configuration in which the heat exchange pipes P are arranged in two rows and a three-row configuration in which three rows are arranged in the width direction. Specifically, the upper side has a three-row configuration from the arc-shaped portion at a substantially intermediate position in the vertical direction, and the lower side including the arc-shaped portion has a two-row configuration. The rear heat exchanger has a three-part configuration as a whole.

  For example, the heat exchange pipe P having a two-row configuration is selected to have a diameter of 7 mm. In the three-row configuration, the heat exchange pipe P in the most leeward row and the most leeward row has a diameter of 5 mm. As the heat exchange pipe P in the middle row, one having a diameter of 5 mm or a diameter of 6.35 mm is selected.

  As will be described later, during the heating operation, the leeward side row heat exchange pipe P having a two-part configuration in the front side heat exchanger portion 8A serves as an inlet portion of the refrigerant. And the heat exchange pipe P of each uppermost end becomes a refrigerant | coolant exit part through the heat exchange pipe P of the 3 part row structure of 8 A of front side heat exchanger parts, and the rear side heat exchanger part 8B.

  At this time, the heat exchanger 8 acts as a condenser, but the heat exchange pipe P diameter on the refrigerant inlet side is selected to be thicker than the heat exchange pipe P diameter of other parts. While the heat transfer coefficient in the heat exchange pipe P is slightly reduced, the refrigerant flow resistance is greatly reduced. As a result, the heat exchange capacity is greatly increased.

  Further, during the cooling operation, the refrigerant flows in the direction opposite to that during the heating operation, and acts as an evaporator. As described above, in this cooling operation, the heat exchange pipe P diameter on the refrigerant inlet side is narrower than the heat exchange pipe P diameter of other parts. As a result, the heat transfer rate in the heat exchange pipe P is improved, and the heat exchange capacity is greatly increased.

  Of the heat exchange pipes P row in the front heat exchanger portion 8A, the row on the side facing the front suction port 4 is the heat exchange air introduction side, so that it is the most windward row of the front heat exchanger portion 8A. . Since the row on the side facing the indoor blower 10 is the heat exchange air outlet side, it is the most leeward row of the front heat exchanger section 8A.

  Similarly, also in the heat exchange pipe P row in the rear heat exchanger 8B, the row on the side facing the upper surface suction port 5 is the heat exchange air introduction side, so that the most upwind side of the rear heat exchanger portion 8B. It becomes a column. Since the row | line | column facing the indoor air blower 10 becomes an air derivation | leading-out side, it becomes the leeward side row | line | column of the rear side heat exchanger part 8B.

  In the most upstream side of the front heat exchanger section 8A, the heat exchange pipe P region indicated by hatching at the top of the figure, and in the most upwind side array of the rear heat exchanger section 8B, indicated by hatching at the top of the figure. Each heat exchange pipe P region is a supercooling region R, which will be described later.

FIG. 2 is a path configuration diagram of the heat exchanger 8 and shows the flow of the refrigerant during the heating operation.
In the most leeward row of the front heat exchanger section 8A, a refrigerant inlet section A1 that splits in two directions is provided slightly below the middle section. The refrigerant is branched from the refrigerant inlet A1 to the upper side and the lower side of the leeward side row of the front heat exchanger 8A. Each moves from the leeward row to the windward row, flows to the lower side and the upper side, and exits and joins from the front heat exchanger portion 8A at a substantially middle portion.

  It is connected to the dehumidifying valve J for reheat dehumidification from the merging portion A2, and further flows out from the dehumidifying valve J and is divided into two directions at the diverting portion A3. One of the divided flows is led to the most leeward side row of the three-row configuration of the front heat exchanger section 8A, and the other of the divided flows is led to the most leeward row of the three-row portion configuration of the rear heat exchanger section 8B. In the front side heat exchanger section 8A and the rear side heat exchanger section 8B, the flow is divided in two directions in the vertical direction by the flow dividing section A4.

  And each enters an intermediate row and merges at the junction A5 in the intermediate row. Jumping is performed from the junction A5 in the middle row to the lowermost end in the windward row. Then, it rises toward the uppermost end, exits from the uppermost end, and becomes the refrigerant outlet portion A6 that joins in the vicinity of the portion where the front heat exchanger portion 8A and the rear heat exchanger portion 8B are bent.

  During the heating operation, the refrigerant gas compressed by the compressor provided in the outdoor unit and heated to high temperature and pressure is guided to the heat exchanger 8 provided in the indoor unit body 1. The refrigerant gas is diverted at the refrigerant inlet portion A1, and is guided through the refrigerant flow path composed of the heat exchange pipes P configured in two rows of the front heat exchanger portion 8A. During this time, the fan 10 is driven to exchange heat with indoor air flowing through the heat exchanger 8.

The refrigerant gas exits from the refrigerant flow path of the front heat exchanger section 8A, merges at the merge section A2, and further flows through the dehumidification valve J at the branch section A3. At this time, the refrigerant has a two-phase region of a gas refrigerant and a liquid refrigerant due to a heat exchange effect with the room air, but the ratio of the gas refrigerant is large.
The refrigerant that has flowed out from the diversion part A3 is diverted in the diversion part A4 in the most leeward row of the front heat exchanger part 8A and the rear heat exchanger part 8B, and moves to the intermediate line. Although the ratio of the liquid refrigerant to the refrigerant is larger than that of the gas refrigerant, it is still a two-phase region.

  In each of the front-side heat exchanger 8A and the rear-side heat exchanger 8B, when the intermediate row merging portion A5 is reached, most of the gas refrigerant is heat-exchanged and changed to liquid refrigerant. And when it jumps from the junction A5 of the middle row to the lowermost end of the windward row and further flows upward toward the uppermost end, it is not only changed to a liquid refrigerant but also becomes a supercooled state.

  A supercooling region R having a temperature gradient in a state in which the front heat exchanger portion 8A and the rear heat exchanger portion 8B are formed in a substantially inverted V shape in a side view is shown in FIG. Heat exchange pipe P from the uppermost end in the windward row of the heat exchanger section 8A to the fourth stage and heat exchange from the uppermost end in the windward row of the rear heat exchanger section 8B to the fourth stage Present in pipe P.

  Most of the flow regions other than the supercooling region R in the front heat exchanger unit 8A and the rear heat exchanger unit 8B are two-phase regions in which the gas refrigerant and the liquid refrigerant are mixed, and the refrigerant changes isothermally. And the refrigerant | coolant exit part A6 is located in the vicinity site | part which came out from the uppermost end part of the windward row | line | column of 8 A of front side heat exchanger parts, and the rear side heat exchanger part 8B.

  In addition, the heat exchange pipe P from the uppermost end in the windward row of the front heat exchanger section 8A to the fourth stage, which forms the supercooling region R, and the uppermost end in the windward row of the rear heat exchanger section 8B A heat shielding slit K is provided so as to surround the heat exchange pipe P from the section to the fourth stage.

  In particular, the heat blocking slits K surrounding the supercooling region R are formed in a key shape (L shape) between each leeward side heat exchange pipe P and the interstage. The upper end portions of the heat shut-off slits K communicate with the end edges of the fins F, respectively, so that the fin F portions of the supercooling region R have three independent sides.

  In other words, in the fin F portion of the supercooling region R, the side portion on the windward side, the side portion on the bent portion side, and the side portion on which the heat blocking slit K is provided are opened. Slightly, only the tip of the key-shaped portion of the heat blocking slit K and the fin F edge are connected to allow heat conduction, but the other three sides independently block heat. Eggplant.

  Therefore, the heat shut-off slit K prevents thermal interference between the supercooling region (low temperature) R having a temperature gradient and the fin F portion of the two-phase region having an isothermal change without the temperature gradient. The fin F part forming the supercooling region R is almost completely shielded from heat, the degree of supercooling is increased, and the heat exchange performance is greatly improved.

Note that thermal interference also occurs between the heat exchange pipes P in the supercooling region R. Therefore, by providing auxiliary slits Kd between these heat exchange pipes P (for example, between the second-stage heat exchange pipe P and the third-stage heat exchange pipe P from the uppermost end), heat due to the temperature gradient is provided. Prevent interference.
In the supercooling region R in the front heat exchanger portion 8A and the rear heat exchanger portion 8B, the lowest temperature is the lowest in the windward row immediately before joining at the refrigerant outlet portion A6. This is a heat exchange pipe P.

  The heat shut-off slit K provided in the vicinity of the heat exchange pipe P at the uppermost end of the windward row in the vicinity of the refrigerant outlet A6 is cut to the upper end edge of the fin F. Due to this incision, the intermediate row and the fin F portion through which the heat exchange pipe P in the leeward side row penetrates are completely separated from each other, and the heat blocking effect is great.

  Further, in each of the front side heat exchanger part 8A and the rear side heat exchanger part 8B constituting the heat exchanger 8, between the (most) windward side heat exchange pipe P and the leeward side heat exchange pipe P. In addition, between the stages of the heat exchange pipes P in the same row, heat-slit slits c are supplementarily provided so as not to impair the rigidity of the fins F.

Below, the manufacturing method of the heat exchanger 8 is demonstrated.
FIG. 3 shows a state in which the heat exchange pipe P is attached to the fin F formed by press working.

As a manufacturing method, first, a process is performed in which an extremely thin plate body is moved in the direction of the arrow in the figure and the fin F shown in the figure is formed by press working. This is so-called row direction feed processing.
That is, a step of providing a plurality of rows of heat exchange pipe mounting holes a with respect to the flow direction of the heat exchange air in the portions that become the fins F of the front heat exchanger 8A and the fins F of the rear heat exchanger 8B. Is done.

  As described above, in the front heat exchanger portion 8A, the heat exchange pipe P has a two-row configuration along the width direction of the fins F from the substantially middle portion in the vertical direction in the figure, and the upper side is 3 The rear heat exchanger 8B has a three-row configuration in the width direction of the fins F.

Simultaneously with the step of providing the heat exchange pipe mounting hole a, or as the next step, between the heat exchange pipe mounting holes a of the front heat exchanger portion 8A and the rear heat exchanger portion 8B (between the step portions). The step of providing the cut and raised b is performed.
The cut and raised b is provided with three rows of cut and raised b along the width direction of the fins F between the heat exchange pipe mounting holes a having a two-row configuration. In addition, two rows of cut-and-raised b are provided between the heat exchange pipe mounting holes a having a three-row configuration.

  At the same time as the step of providing the cut-and-raised b, or as the next step, for mounting the heat exchange pipe between the windward side row and the leeward side row in the fins F of the front heat exchanger portion 8A and the rear heat exchanger portion 8B. There is a step of providing auxiliary slits c intermittently in the longitudinal direction between the holes a, and also providing auxiliary slits c between the stages of the heat exchange pipe mounting holes a of the front heat exchanger section 8A.

  At the same time, in the fins F of the front heat exchanger section 8A and the rear heat exchanger section 8B, the heat exchange pipe mounting holes a that are the most leeward row and the heat exchange pipe mounting holes a of the leeward row are There is a step of providing a heat shielding slit K between them. The heat blocking slit K is provided so as to surround the above-described supercooling region R indicated by hatching.

  At the same time, there is a step of providing an auxiliary slit Kd between the second heat exchange pipe P and the third heat exchange pipe P from the uppermost end in the supercooling region R. Since the heat shut-off slit K and the auxiliary slit Kd relate to the supercooling region R, they are indicated by different symbols from the auxiliary slit c described above.

  The upper end of the heat blocking slit K provided in the fin F of the front heat exchanger 8A and the lower end of the heat blocking slit K provided in the fin F of the rear heat exchanger 8B are the front heat exchanger. The connecting portion M between the portion 8A and the rear heat exchanger portion 8B is provided so as to overlap (wrap) with each other in the width direction of the fin F.

  Further, the lower end portion of the heat blocking slit K provided in the fin F of the front heat exchanger portion 8A and the upper end portion of the heat blocking slit K provided in the fin F of the rear heat exchanger portion 8B are the fins F It is formed in a key shape toward the windward side edge. A slight uncut portion d is left between the key-shaped tip and the windward edge of the fin F.

  Finally, the entire fin F is punched (separated) into the shape shown in FIG. By this process, the fin F forming the front heat exchanger portion 8A on the lower side and the fin F forming the rear heat exchanger portion 8B on the upper side are integrally formed continuously in the longitudinal direction.

  In this state, the fin F of the front heat exchanger portion 8A has a substantially middle portion in the vertical direction in the drawing formed in a substantially arc shape, and an upper portion and a lower portion of the arc portion are formed in a straight shape. The rear heat exchanger portion 8B has a straight shape throughout. The connecting part M that forms the boundary between the front side heat exchanger part 8A and the rear side heat exchanger part 8B is largely cut, has a narrow dimension in the width direction, and is tightly formed.

In addition, the order of each process mentioned above is not specifically limited.
Next, the heat exchange pipe P having a suitable diameter is inserted into the heat exchange pipe mounting holes a provided in the fins F of the front heat exchanger section 8A and the rear heat exchanger section 8B. In this state, the heat exchange pipe P is a U-shaped tube bent in a U-shape. After the U-shaped tube is inserted into a predetermined state, a process of expanding the heat exchange pipe P and fitting and fixing it to the fin F is performed.

  Next, a process of forming a cut portion Kb by performing cut processing in the width direction of the fin F across the overlapping portion or the communicating portion formed at one end portions of the heat shielding slit K is performed. The cut portion Kb is cut from the leeward edge of the fin F, and this tip has a slight gap from the leeward edge of the fin.

  Next, the front heat exchanger portion 8A and the rear heat exchanger portion 8B are bent from the cut portion Kb obtained in the above process, and the front heat exchanger 8A and the rear heat are used with the cut portion Kb as an upper end portion. A step of bending the exchanger portion 8B into a substantially inverted V shape in a side view is performed.

The fin F may be cut in the width direction over the entire length in the width direction to completely separate the front heat exchanger portion 8A and the rear heat exchanger portion 8B. The separated front heat exchanger 8A and rear heat exchanger portion 8B are arranged in a substantially inverted V shape in a side view with the cut portion as an upper end portion. In this case, when the upper end portions are separated from each other, a substantially C-shape is formed, but this form is also included.
Finally, the heat exchanger 8 is completed by brazing U-bends or the like to the open ends of adjacent U-shaped pipes with the heat exchange pipes P fitted and fixed to the fins F in accordance with the flow path configuration. .

In this way, since the front heat exchanger portion 8A and the rear heat exchanger portion 8B constituting the heat exchanger 8 are manufactured, the heat blocking slit K surrounding the supercooling region R is provided. , Manufacturing effort is not required and man-hours are not affected.
The heat shield slit K is provided so that the connecting part M side, which is one end side of the front heat exchanger part 8A and the rear heat exchanger part 8B, overlaps (wraps) in the width direction of the fins F. The other end side of the blocking slit K is bent to the windward side and formed in a key shape.

  A slight uncut portion d is left between the key-shaped tip and the windward edge of the fin F, and in this state, there are uncut portions on both ends of the heat blocking slit K. Therefore, the rigidity reduction of the fin F alone in the pressed state is small, the deformation of the fin F is small, and the manufacturability is not greatly adversely affected.

Further, the key-shaped heat shielding slit K part partitions the steps between the heat exchange pipes P (longitudinal direction of the fin F) and only leaves a slight uncut portion d. Heat transfer between adjacent heat exchange pipes P can also be prevented.
In the embodiment described above, in the connecting portion M between the front heat exchanger portion 8A and the rear heat exchanger portion 8B, the heat shielding slits K are provided so as to overlap (wrap) one end portions thereof. However, the present invention is not limited to this.

FIG. 4 is an enlarged front view of a part of the fin F that has been press processed and to which the heat exchange pipe P is inserted and fixed.
That is, although the rigidity of the fin F slightly decreases, it is formed so that one end portions of the slits of the front heat exchanger 8A and the rear heat exchanger communicate with each other, and the cut portion Kb is provided for the communication portion Kc. It may be.

  After the heat exchange pipe P is inserted into the heat exchange pipe mounting hole a and expanded and fixed to the fin F, the tip of the key-shaped portion of the heat shield slit K and the windward edge of the fin F The uncut portion d left in between may be completely cut. In this way, the supercooling region R portion is completely independent of the two-phase region fin F portion, and the heat exchange performance is further improved.

FIG. 5 is a front view of the end plates 20 provided on both sides of the heat exchanger 8.
The end plate 20 is located on both sides of the front heat exchanger portion 8A and the rear heat exchanger portion 8B constituting the heat exchanger 8 and supports holes for supporting the heat exchange pipes P penetrating the fins F. 21 is provided. However, the heat exchange pipe P located in the supercooling region R described above has a long hole portion 22 that is cut from the windward end edge and one end portion is opened.

  In the fin F, a heat blocking slit K is provided so as to surround the heat exchange pipe P in the supercooling region R. The heat blocking slit K has only a slight uncut portion d between the tip of the key-shaped portion and the windward edge of the fin F, so that heat exchange that forms the supercooling region R is performed. When a force is applied to the pipe P in the direction indicated by the two-dot chain line arrow in FIG. 5, the non-cut portion d is deformed relatively easily.

  As a result, the width dimension of the heat shut-off slit K increases, and only the supercooling region R is separated from the adjacent fin F portion and becomes independent. Not only can direct heat transfer from adjacent fin F portions be blocked, but also conduction of radiant heat can be prevented, and heat exchange performance is further improved.

  FIG. 6 is a partial front view of the heat exchanger 8 after the processing described in FIG. 5 is performed. Here, a case is shown in which the heat blocking slits K are provided so as to communicate with each other at the upper end of the front heat exchanger portion 8A and the lower end of the rear heat exchanger portion 8B. The above processing can also be performed after the front heat exchanger 8A and the rear heat exchanger portion 8B are arranged in a substantially inverted V shape in a side view.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments.

The schematic longitudinal cross-sectional view of the indoor unit of the air conditioner based on one Embodiment in this invention. The path | pass block diagram of the heat exchanger at the time of heating operation based on the embodiment. The front view of the fin by which the press process based on the embodiment was carried out. The partial front view of the press-processed fin based on the modification in the embodiment. The front view of the heat exchanger endplate based on the embodiment. The partial front view of the heat exchanger obtained based on the embodiment.

Explanation of symbols

  F ... Fin, P ... Heat exchange pipe, 8A ... Front heat exchanger part, 8B ... Rear heat exchanger part, 8 ... Heat exchanger, a ... Heat exchange pipe mounting hole, K ... Heat insulation slit, Kb ... cut part, d ... non-cut part, 20 ... end plate, 22 ... long hole part, 4 ... front suction port, 5 ... top suction port, 6 ... blowout port, 1 ... indoor unit body, 10 ... blower, R ... Supercooling region, A6 ... refrigerant outlet.

Claims (6)

It consists of a plurality of fins arranged side by side at a predetermined interval, and heat exchange pipes that penetrate the fins and are provided in a plurality of rows along the flow direction of the heat exchange air. In the manufacturing method of the heat exchanger for manufacturing the heat exchanger configured to form a substantially inverted V shape in a side view from the exchanger part,
The fins forming the front heat exchanger part and the fins forming the rear heat exchanger part are integrally formed continuously in the longitudinal direction, and the fins of the front heat exchanger part and the rear heat exchanger are formed. In each of the fins, the one end of each of the fins overlaps in the width direction of the fins between the heat exchange pipe mounting hole that is the most leeward row and the heat exchange pipe mounting hole that is the leeward row, or Providing a heat blocking slit along the longitudinal direction of the fin so as to communicate with each other;
A step of cutting in the width direction of the fin across the overlapping portion or the communicating portion formed between the one end portions of the heat shielding slit provided in each of the front heat exchanger portion and the rear heat exchanger portion, and
And a step of arranging the front heat exchanger and the rear heat exchanger portion so as to have a substantially inverted V shape in a side view with the cut portion as an upper end. . The heat shut-off slit provided in each of the front heat exchanger part and the rear heat exchanger part is provided such that the other end of each is bent toward the windward edge of the fin, and the tip thereof 2. The method for manufacturing a heat exchanger according to claim 1, wherein a gap is left between the windward edge of the fin and a non-cut portion is left. An end plate for penetrating and supporting the heat exchange pipe is provided on the sides of the front heat exchanger part and the rear heat exchanger part,
3. The end plate according to claim 1, further comprising a long hole portion that allows the heat exchange pipes in the windward row to be further displaced further to the windward side than the heat blocking slits. The manufacturing method of the heat exchanger of description. An indoor unit body equipped with a suction port and a blowout port;
From the front side heat exchanger part located in the front side of the said indoor unit main body, and the rear side heat exchanger part located in the rear surface side which are arrange | positioned in this indoor unit main body, and comprise substantially reverse V shape by side view. A heat exchanger composed of;
A blower disposed between the front heat exchanger part and the rear heat exchanger part of the heat exchanger,
The indoor unit of an air conditioner, wherein the heat exchanger is manufactured by the method for manufacturing a heat exchanger according to any one of claims 1 to 3.   In the front side heat exchanger part and the rear side heat exchanger part constituting the heat exchanger, the refrigerant flow path is set so that the heat exchange pipes in the windward row are located in the supercooling region with respect to the heat blocking slit during heating operation. The indoor unit of the air conditioner according to claim 4, wherein   6. The heat exchange pipe constituting the supercooling region in the windward row from the heat blocking slit is configured such that the heat exchange pipe located at the uppermost end serves as a refrigerant outlet portion. Air conditioner indoor unit.

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